DE102006036422A1 - Liquid cooled cylinder head for an internal combustion engine - Google Patents

Abstract

Liquid-cooled cylinder head (1) for an internal combustion engine, having first and second outlet passage walls (3, 4) adjacent to one another and surrounded by a coolant channel (2) for two outlet gas exchange valves, spaced from an inlet side, from the outlet passage walls (3). 3, 4) formed gusset region (5) at least partially by a coolant channel (2) surrounded dome (6) is arranged for a largely centrally to one of the cylinder head (1) covered combustion chamber can be arranged engine component and the coolant channel (2) a first , substantially centrally between the first and the second Auslaßkanalwandung (3, 4) arranged inflow opening (2 ') and a second and a third, from the first inflow opening (2') spaced inflow opening (2 '', 2 '' ') in one Has cylinder head parting plane (1 ') and starting from the first inflow opening (2') largely over the combustion chamber and between the first and the second outlet channel wall (3, 4) in the direction of the dome (6) erstrekct and starting from the second and the third inflow opening (2 '', 2 '' ') substantially over the combustion chamber and radially around the extending first and the second outlet channel wall (3, 4) in the direction of the dome (6) and extending from the dome (6) in the direction of the inlet side of the cylinder head (1) and wherein in the gusset region (5) a first in the direction Dom (6 ) extending flow guide rib ...

Description

The The invention relates to a liquid-cooled cylinder head for one Internal combustion engine with the features of the preamble of the claim 1.

The technical environment, for example, on the German patent specification PS 35 16 453 C2 in which a liquid-cooled cylinder head for a cylinder bank of a multi-cylinder internal combustion engine is described. In this cylinder head Gaswechseleinlass- and Gaswechselauslasskanäle with gas exchange valves, as well as arranged in a dome bore for receiving a spark plug or an injection valve is provided. Further, the cylinder head has cooling liquid spaces bounded by the walls of the combustion chambers and through which the inlet and outlet passages and the dome extend. The cooling liquid spaces have inflow openings in the cylinder head floor and communicate with cooling chambers in the cylinder block. The cooling liquid spaces for the individual combustion chambers are separated from each other such that each cooling liquid space is formed by a single annular space surrounding the dome, which is penetrated only by the gas exchange inlet and gas exchange outlet channels and the valve guides for the gas exchange outlet valve (s). The peripheral wall of the annulus has vertical ribs extending toward the mandrel. The drain channel of each annulus empties into a drain collection channel extending along the cylinder head.

Further is a liquid-cooled cylinder head for one Internal combustion engine for the BMW inline six-cylinder diesel engine with the BMW internal designation M 57 known for several years, for example, in the BMW 3 Series is built and from which the present invention proceeds. Of the Cylinder head is for a four-valve internal combustion engine provided, wherein the cylinder head Gas exchange inlet ducts and gas exchange outlet channels having. The Gaswechselauslasskanäle are like the gas exchange inlet channels in pairs arranged and form the cylinder head wall towards a common single exhaust outlet duct. The Gaswechselauslasskanäle be formed by Auslasskanalwandungen that form a gusset inlet side. Adjacent to the gusset, continue towards the inlet side of the cylinder head, is a dome with a hole arranged in which the fuel injector is arranged. The dome and the outlet duct walls are extensive from a coolant channel flows around, the through three inlet bores in a cylinder head parting plane the crankcase with coolant is charged. During operation of the internal combustion engine, the coolant flows through the three coolant inflow openings in the cylinder head, flows around glasses shaped the outlet duct walls and the area of the valve seat rings and flows continue in the direction of the cathedral. Starting from the dome, the coolant flows continue towards the inlet side of the cylinder head and back into the Crankcase of the Internal combustion engine.

Also when the liquid-cooled cylinder head has no disadvantages, it may be that at another Increasing the performance of the internal combustion engine in the area of the cathedral hot area formed.

task The present invention is a measure to show a even better cooling to achieve the cathedral.

These The object is achieved by the feature in the characterizing part of the claim 1 solved.

A further improvement of the cooling of the dome is achieved by the embodiment according to claim 2.

The geometric configurations according to the claims 3 and 4 are particularly preferred size ranges.

The Production of the cylinder head is particularly preferably according to claim 5th

In Advantageously, the embodiment according to the invention according to claim 6 either for a self-igniting Internal combustion engine that works on the diesel principle or for an Otto internal combustion engine with spark ignition be used.

in the The invention is based on the prior art and a particularly preferred embodiment in five Figures closer explained.

1 shows a section through a known from the prior art cylinder head.

2 shows a plan view of a portion of a casting core for a coolant channel of the known from the prior art cylinder head.

3 shows a section through an inventively designed cylinder head.

4 shows a plan view of a portion of a casting core for inventively designed cylinder head.

5 shows a plan view of a three-dimensionally illustrated portion of the inventively designed cylinder head.

In the 1 to 5 the same reference numbers apply to identical components.

1 shows a section through a cylinder head 1 perpendicular to its longitudinal axis through a dome 6 for receiving a fuel injection valve in a bore 11 , The cylinder head 1 has a coolant channel 2 on, whose three-dimensional geometry in 2 is shown. In 1 a hatched area is hatched. The cylinder head 1 is provided for a self-igniting internal combustion engine with two Gaswechseleinlass- and two Gaswechselauslassventilen and has an outlet channel with a first Auslasskanalwandung 3 and a second outlet channel wall 4 on. The first and the second outlet channel wall 3 . 4 merge in the area of a gas outlet from the cylinder head 1 to a common outlet channel 9 , The first and second exhaust passage walls 3 . 4 form on the inlet side, on the coolant channel 2 side facing each other a gusset 5 , Distanced from the gusset 5 is toward an inlet side of the cylinder head 1 the cathedral 6 arranged.

Starting from a not shown crankcase facing cylinder head separation plane 1' points the cylinder head 1 a first inflow opening 2 ' on, the middle between the first and the second Auslasskanalwandung 3 . 4 is arranged. In this first inflow opening 2 ' Coolant flows from the crankcase into the cylinder head 1 , A coolant flow is in the 1 to 4 shown schematically with arrows. Subsequently, the coolant continues to flow at the cathedral 6 over in the direction of the intake side of the cylinder head 1 and back into the crankcase, not shown, of the internal combustion engine.

2 shows a plan view of a portion of a casting core for the coolant channel 2 the known from the prior art cylinder head 1 , In 2 it can be seen that adjacent to the first inflow opening 2 ' each geodetic under the first and the second outlet channel wall 3 . 4 a second and a third inflow opening 2 '' . 2 ''' for the coolant channel 2 is provided. During operation of the internal combustion engine, the coolant from a coolant pump, not shown, through the three inflow openings 2 ' . 2 '' . 2 ''' in the cylinder head 1 pumped, wherein the area radially around valve seat rings, not shown, as well as the radially outer region of the first and the second Auslasskanalwandung 3 . 4 is cooled. From there, the coolant flows, as described above in the direction of the cathedral 6 and then continue towards the inlet side of the cylinder head 1 ,

If the performance of the internal combustion engine is significantly increased, it may be that in the known from the prior art cylinder head 1 at the bottom of the cathedral 6 a hot area 10 formed.

In the 3 and 4 is the same cylinder head 1 from the 1 and 2 shown again, but with the inventive design of the coolant channel 2 , 3 shows the same cut as 1 . 4 shows the same view of the section of the casting core for the coolant channel 2 as 2 ,

In 3 is an invention according to the gusset area 5 molded first flow guide rib 7 with registration to the cathedral 6 shown. Next is the cathedral 6 a second flow guide rib 8th formed in the direction of the first flow guide rib 7 extends. Due to the embodiment of the invention is achieved that between the second flow guide 8th and the first flow guide rib 7 , or the first and the second Auslasskanalwandung 3 . 4 a flow gap is formed with a width between 2 and 10 mm. Hereby it is achieved that relatively little coolant geodetically upwards into the coolant channel 2 flows, leaving the critical foot area of the dome 6 flows around with coolant and thus is better cooled.

By this embodiment of the invention, the formation of a hot area 10 how it can be formed in the cited prior art at a performance increase of the internal combustion engine, avoided. In a simpler embodiment, the second flow guide rib 8th omitted when the first flow guide rib 7 accordingly continue in the direction of the cathedral 6 is formed. A preferred thickness of the first and second flow guide ribs 7 . 8th is between 3 and 10 mm. In the most preferred embodiment, the first and second flow guide ribs are 7 . 8th in one piece and with the same material as the cylinder head 1 educated. In other embodiments, the flow guide rib 7 and or 8th Also be designed as an insert or a cast component. In the cathedral 6 Either a fuel injection valve and / or an ignition device can be arranged. Thus, it is possible, the inventive design of the cylinder head 1 to use both for self-igniting internal combustion engines as well as for externally ignited internal combustion engines.

In 4 can be seen as the improved flow of the dome 6 is further improved with coolant. While in the prior art, the valve seat inserts of the gas exchange outlet valves are surrounded by spectacles radially, according to the invention a short-circuit flow between the first inflow opening 2 ' and the second and third ones flow orifice 2 '' . 2 ''' avoided. Otherwise, the same applies as the execution too 2 ,

5 shows the top view of a three-dimensional cutout of the cylinder head 1 in the region of the first and the second outlet channel wall 3 . 4 , Dargstellt is the gusset area 5 to which the first flow guide rib 7 is formed. Starting from the gusset 5 is the cathedral 6 arranged in the direction of the inlet side. To the cathedral 6 is the second flow guide rib 8th formed in the direction of the first flow guide rib 7 extends

In summary, in other words:
In order to direct the flow of the coolant in a particularly preferred embodiment as desired, a first flow guide rib 7 in the gusset 5 between the outlet channels and a second flow guide rib 8th at the cathedral 6 proposed. Furthermore, in the Kühlmitteleinströmbereich on the valve seat rings, the two branches to the lateral Überertritte 2 '' . 2 ''' closed. Through the first flow guide rib 7 between the outlet channels becomes the main coolant quantity of the middle crossing 2 ' to the dome 6 and then continue with the help of the second flow guide rib 8th at the cathedral 6 between the exhaust valves and the dome 6 directed. The first flow guide rib 7 between the exhaust ports is made very thin, on the one hand, the rigidity of the cylinder head 1 to influence only slightly and not to disturb the flow of coolant on the upper deck of the coolant jacket. The second flow guide rib 8th at the cathedral 6 and the first flow guide rib 7 between the outlet channels are separated by a thin gap. This allows a reduced flow of the coolant from bottom to top. The second flow guide rib 8th at the cathedral 6 is not connected to the outlet channels, so that channel cracks can be avoided.

Through the two flow guide ribs 7 . 8th at the cathedral 6 between the outlet channels, the coolant flow of the middle crossing 2 ' steered as desired and a component temperature reduction can be achieved, resulting in a substantial increase in fatigue strength.

The production of the casting core is achieved by the division of the flow guide ribs 7 . 8th facilitated. By a suitable choice of the pulling direction, the first Strömungsleitrippe 7 for example, mitgeformt between the outlet channels with a lateral slide. The second flow guide rib 8th at the cathedral 6 For example, it can be produced by an insert in the region of the inlet channels or by a slide which is integrated in the upper or lower half of the core tool. The width and shape of the two flow guide ribs 7 . 8th This can also be easily adjusted.

1.

cylinder head

1'

Cylinder head parting plane

Second

Coolant channel

2 '

first inflow

2 ''

second inflow

2 '' '

third inflow

Third

first Auslasskanalwandung

4th

second Auslasskanalwandung

5th

interstitial region

6th

cathedral

7th

first flow guide

8th.

second flow guide

9th

exhaust port

10th

hot area

11th

drilling

Claims (6)

Liquid cooled cylinder head ( 1 ) for an internal combustion engine, with a first and a second, adjacent to each other, partially merging into each other, from a coolant channel ( 2 ) surrounded outlet channel wall ( 3 . 4 ) for two outlet gas exchange valves, spaced from an inlet side, from the outlet channel walls (FIG. 3 . 4 ) formed gusset area ( 5 ) at least partially from the coolant channel ( 2 ) surrounded cathedral ( 6 ) is arranged for a substantially centered to one of the cylinder head ( 1 ) covered combustion chamber can be arranged on an engine component and wherein the coolant channel ( 2 ) a first, substantially centrally between the first and the second outlet channel wall ( 3 . 4 ) arranged inlet opening ( 2 ' ) and a second and a third, from the first inflow opening ( 2 ' ) diametrically spaced inlet opening ( 2 '' . 2 ''' ) in a cylinder head separation plane ( 1' ) and starting from the first inflow opening ( 2 ' ) substantially over the combustion chamber and between the first and the second outlet channel wall ( 3 . 4 ) towards the cathedral ( 5 ) and starting from the second and the third inflow opening ( 2 '' . 2 ''' ) substantially over the combustion chamber and radially to the first and the second Auslasskanalwandung ( 3 . 4 ) towards the cathedral ( 6 ) and starting from the dome ( 6 ) in the direction of the inlet side of the cylinder head ( 1 ), characterized in that in the gusset region ( 5 ) a first, towards Dom ( 6 ) extending flow guide rib ( 7 ) is arranged. Liquid-cooled cylinder head according to claim 1, characterized in that the dome ( 6 ) a second, to the first flow guide rib ( 7 ) corresponding flow guide rib ( 8th ) is arranged. Liquid-cooled cylinder head according to claim 2, characterized in that a clearance between the second Strömungsleitrippe ( 8th ) and the first flow guide rib ( 7 ) and the first and the second outlet channel wall ( 3 . 4 ) is between 2 and 10 mm. Liquid-cooled cylinder head according to claim 2 or 3, characterized in that a thickness of the first and second Strömungsleitrippe ( 7 . 8th ) is between 3 and 10 mm. Liquid-cooled cylinder head according to one of the claims 2 to 4, characterized in that the first and second flow guide ribs ( 7 . 8th ) in one piece and of the same material as the cylinder head ( 1 ) are. Liquid cooled cylinder head according to one of the claims 1 to 5, characterized in that the internal combustion engine component a fuel injection valve and / or an ignition device is.